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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88015b85bab8133a02e294ad5d18137aa18d1161be2b734c645af287447183c1' 
  AND token = 'hY/TvQlCQf5T14LwFs2Nywu8pW9oKefGrB5c3A4prQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}